Article Abstract

	Title:	Average treatment effect estimators – inefficiency – minimisation of variance
	Author:	Athanasios G. Tsagkanos
	Address:	Department of Business Administration of Food and Agricultural Enterprises, University of Ioannina, 2 G. Seferi Str. Agrinio 301 00, Greece
	Journal:	International Journal of Computational Economics and Econometrics 2009 - Vol. 1, No.1  pp. 1 - 8
	Abstract:	In this paper, we show the inability of a recent average treatment effect estimator (ATE) to catch up the asymptotic semiparametric efficiency bound of Hahn (1998) although it minimises the mean squared error. Additionally, we propose the use of a minimum variance unbiased uniformly estimator of the propensity score in order to minimise the loss of efficiency.
	Keywords:	average treatment effect; ATE estimator; propensity score; minimum variance unbiased uniformly estimator; efficiency loss.
	DOI:	10.1504/IJCEE.2009.029149
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